This list simply contains all contacts of all customers, allowing to work with them from centralized place.
You can quickly delete or archive old contacts, write mail messages, or just quickly edit personal information.
When you create an e-message to any customer's contact (for example, from a job list, or invoice list, or other place), the system will automatically use main e-mail address. If alternative e-mail is specified for a contact, it will be automatically add to the CC field.